Question

the 1990s.
vegetable yield (cartons per acre)
number of cartons per acre
vegetables
in 1995, which vegetable had the lowest yield?
broccoli romaine lettuce leaf lettuce

Explanation:

The green bars represent 1995 yields. Comparing the heights of green bars: leaf lettuce (~1000), broccoli (~500), romaine lettuce (~550). Broccoli has the shortest green bar, so it had the lowest yield in 1995.

Answer:

broccoli